Absolutely. Your license covers your extended family, including aunts, uncles, cousins, and in-laws. You all would use the same callsign, (yours) and just use your names, or you can assign unit numbers.... as in my family, I am unit 1, wife is unit 2, sons in order of birth are units 3, 4, and 5. If you have a big extended family get together, say at a lake, and everyone is using radios, just using your names is easier, but you all are under the same family callsign. If your wife was calling you on the radio, she would say: "WRAU978 Unit 2 to Unit 1, Jeremy, can you hear me?". Simple as that.